[PATCH 4.19 047/170] ipv6: route: Fix return value of ip6_neigh_lookup() on neigh_create() error

From: Greg Kroah-Hartman
Date: Mon Jan 07 2019 - 07:48:22 EST

4.19-stable review patch. If anyone has any objections, please let me know.


From: Stefano Brivio <sbrivio@xxxxxxxxxx>

[ Upstream commit 7adf3246092f5e87ed0fa610e8088fae416c581f ]

In ip6_neigh_lookup(), we must not return errors coming from
neigh_create(): if creation of a neighbour entry fails, the lookup should
return NULL, in the same way as it's done in __neigh_lookup().

Otherwise, callers legitimately checking for a non-NULL return value of
the lookup function might dereference an invalid pointer.

For instance, on neighbour table overflow, ndisc_router_discovery()
crashes ndisc_update() by passing ERR_PTR(-ENOBUFS) as 'neigh' argument.

Reported-by: Jianlin Shi <jishi@xxxxxxxxxx>
Fixes: f8a1b43b709d ("net/ipv6: Create a neigh_lookup for FIB entries")
Signed-off-by: Stefano Brivio <sbrivio@xxxxxxxxxx>
Reviewed-by: David Ahern <dsahern@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
net/ipv6/route.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -210,7 +210,9 @@ struct neighbour *ip6_neigh_lookup(const
n = __ipv6_neigh_lookup(dev, daddr);
if (n)
return n;
- return neigh_create(&nd_tbl, daddr, dev);
+ n = neigh_create(&nd_tbl, daddr, dev);
+ return IS_ERR(n) ? NULL : n;

static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst,